FREE-VALVE brand pneumatic Ceramic Lined Ball Valves are designed with engineering ceramics as a control valve or shut off valve . The engineering ceramics internal parts provide excellent wear resistance and corrosive resistance , the ceramic ball valves are widely used as an open and close function as well as a throttling control tasks in corrosive medium with abrasive solids content. They are the best choice for your abrasive and corrosive working condition on site .